| Grunnmurspesialisten AS | Hamar | 2006 |
| Grunnpartner AS | Overhalla | 2014 |
| Grunnplan AS | Moi | 2025 |
| Grupa Ozon AS | Berger | 2024 |
| Grupa Vezzen Marcin Tarnowski Nuf | 83-047 Przywidz | 2014 |
| Grupo GRL in Norway Nuf | 15650 Cambre La Coruña | 2018 |
| Gruppen 87 AS | Rud | 2015 |
| Gruppo Millepiani S.P.A | It-20826 Misinto Mb | 2025 |
| Grus & Anlegg AS | Gvarv | 1992 |
| Grusoppretteren AS | Krokstadelva | 2016 |
| Grutle Total AS | Haugesund | 2024 |
| Grythe Holding AS | Sande I Vestfold | 2018 |
| Grythe Maskin AS | Sande I Vestfold | 2018 |
| Grythyttans Skiffermontage | Se-71260 Grytthyttan | 2010 |
| Gryting Consulting AS | Sundebru | 2013 |
| Grytvik Snekkerservice AS | Hamarvik | 2018 |
| Grzegorz Byggteam AB | Se-263 91 Jonstorp | 2023 |
| Grzegorz Dobrzanski Budrom | 51-668 Wroclaw | 2007 |
| Grzegorz Guczalski | 43-600 Jaworzno | 2007 |
| Grzegorz Gutowski Hexagon | Pl - 07 300 Ostrow Mazowiecka | 2016 |
| Grzegorz Herman, Building Construction & Transport Services | Oslo | 2006 |
| Grzegorz Krupinski | 83-100 Tczew | 2005 |
| Grzegorz Krzewski | 81 007 Gdynia | 2007 |
| Grzegorz Langa, Lang | 81-006 Gdynia | 2006 |
| Grzegorz Lizurej Li | 42-700 Lubliniec | 2007 |
| Grzegorz Pranszke Budex | 84200 Wejherowo | 2006 |
| Grzegorz Wrzesniewski | 46-250 Wolczyn | 2010 |
| Gråkjær Landbruk | Dk-7500 Holstebro | 2019 |
| Gråkjær Nuf | 7500 Holsterbro | 2015 |
| Grålum Bygg AS | Grålum | 2019 |
| Grålum VVS AS | Grålum | 2022 |
| Græsdal Bygg AS | Ålesund | 2007 |
| Græsdal Glass AS | Skodje | 1995 |
| Grönsta.Nop AB | Se-635 02 Eskiltuna | 2020 |
| Grødeland AS | Randaberg | 2025 |
| Grødem Bygg AS | Nærbø | 2024 |
| Grødem Service AS | Kvernaland | 2023 |
| Grøft Og Nybrott Invest AS | Skarnes | 2017 |
| Grøft&Løft AS | Kristiansand S | 2024 |
| Grøgard Maskin AS | Prestfoss | 2014 |
| Grøndalen Miljøanlegg AS | Hemsedal | 2003 |
| Grønland Blikk Vent Og Sveis Da | Drammen | 2000 |
| Grønli Bygg AS | Sellebakk | 2017 |
| Grønli Holding AS | Hafrsfjord | 2023 |
| Grønli Og Sønner AS | Skien | 1998 |
| Grønlie Holding AS | Rygge | 2019 |
| Grønliveien 30 AS | Strømmen | 2018 |
| Grønlund Maskin AS | Storslett | 2024 |
| Grønn Bee AS | Jevnaker | 2015 |
| Grønn Energi Midt-Norge AS | Trondheim | 2010 |
| Grønn Energi Vestlandet AS | Trondheim | 2026 |
| Grønn Energi Østlandet AS | Trondheim | 2026 |
| Grønn Holding AS | Hokksund | 2016 |
| Grønn Horisont AS | Farsund | 1993 |
| Grønn Hus AS | Sandnes | 2023 |
| Grønn Kjøling AS | Aurdal | 2019 |
| Grønn Kraft Maskin AS | Åmli | 2015 |
| Grønn Montasje AS | Larvik | 2015 |
| Grønn Rehab Og Miljøsanering AS | Billingstad | 2023 |
| Grønn Strøm AS | Nesbru | 2021 |
| Grønn Strøm Drammen AS | Nesbru | 2024 |
| Grønn Strøm Holding AS | Nesbru | 2021 |
| Grønn Strøm Lillestrøm AS | Lillestrøm | 2024 |
| Grønnbolig AS | Fredrikstad | 2014 |
| Grønnbolig Fana AS | Nesttun | 2017 |
| Grønne Former AS | Lierstranda | 2022 |
| Grønne Investeringer AS | Rolvsøy | 2004 |
| Grønne Mur & Flis AS | Nesbru | 2017 |
| Grønne VVS AS | Oslo | 2018 |
| Grønningen Bygg AS | Lensvik | 2024 |
| Grønnpå AS | Kristiansand S | 2025 |
| Grønnslottet /Graving & Anleggsgartnertjenster AS | Lillestrøm | 2021 |
| Grønsberg Bygg AS | Florø | 2007 |
| Grønsberg Invest AS | Florø | 2018 |
| Grønsdal Maskin & Eiendom AS | Skare | 2026 |
| Grønseth Maskin AS | Gjemnes | 2011 |
| Grønstvet Og Huseby AS | Kråkstad | 2014 |
| Grønt Bygg AS | Porsgrunn | 2019 |
| Grønt Utemiljø Innlandet AS | Gran | 2020 |
| Grøntjernveien SA | Hof | 1957 |
| Grønvold Bygg AS | Hurdal | 2012 |
| Grønvold Byggservice AS | Vestby | 2024 |
| Grønvold Holding AS | Hurdal | 2012 |
| Grønvold Maskin Og Transport AS | Fannrem | 2020 |
| Grønvold She AS | Sandnessjøen | 2014 |
| Grøseth Eiendom AS | Bosberg | 2020 |
| Grøstad Allservice AS | Vestby | 2020 |
| Grøstad Ranch AS | Tranby | 2024 |
| Grøten AS | Fotlandsvåg | 2009 |
| Grøterud AS | Vikersund | 2023 |
| Grøterud Bulldozerlag Anlegg AS | Prestfoss | 1994 |
| Grøterud Bulldozerlag AS | Prestfoss | 2003 |
| Grøterud Holding AS | Kongsberg | 2006 |
| Grøterud Rørservice AS | Lyngdal I Numedal | 2021 |
| Grøterud VVS AS | Solumsmoen | 2025 |
| Grøteruds Byggservice AS | Vikersund | 1979 |
| Grøtjord Og Wuttudal Maskin Da | Fannrem | 2001 |
| Grøttumsbråtens Eftf. AS | Oslo | 2016 |
| Grøtvedt Bygg Og Eiendom AS | Spydeberg | 2021 |
| Grøtåsen AS | Hønefoss | 2018 |